fix(issue-5): address phase 2a cross-review findings (F-A, F-B, R1, R2, R3)

Two reviewers raised five defects. Every one was reproduced here before being
accepted; none were rebutted.

F-A (claude, blocking) -- the CAS table had no row for two transitions the
wrapper legitimately makes, so `submit --type loop|discuss` silently stopped
working by default: the per-iteration re-dispatch was refused and its metadata
discarded, the exhausted-budget finalisation was refused, and the CLI returned 0
both times. Reproduced against the real modules. Fixed by naming those
transitions rather than carving an exception: `redispatch` and `finalize` are
requests gated on operator authority, so the wrapper can move a finished record
while an agent still cannot touch its own terminal. A re-dispatch must advance
the iteration, so a replay cannot resurrect a job. The operator CLI now exits
non-zero with a reason when a write is refused -- the silence is what let this
hide.

F-B (claude) -- moving the audit mirror out of the lock made status.json
last-writer-wins, so a slow flush could leave it behind the registry. It now
carries transition_seq and skips a write that would go backwards, restoring the
sequential consistency the lock used to provide for free.

R1 (codex, blocking) -- the policy called attribution with only the dispatch
record, so it proved the record was well-formed and never confronted the
identifiers the evidence carried. A finalized scenario with a different session,
a different attempt and a manifest from another attempt was still approved.
Observed identifiers are now collected from the timeline and every one must
agree; a manifest belonging to another attempt holds. Collecting every
occurrence rather than the first matters, because taking the first would drop
exactly the contradicting value this is meant to catch.

R2 (codex, blocking) -- a supplied expected_attempt was ignored when the record
had no attempt field, so a compare-and-swap with nothing to compare committed.
It now fails closed, which matters because 2b plans to gate inferred completion
on precisely that precondition.

R3 (codex) -- a status could ride in as an ordinary field, so `progress` could
commit a terminal from inside the boundary that exists to prevent it. Status is
now settable only by the request that owns it, unknown requests are refused, and
pending has an owning request instead of being an untyped merge.

Each of the eleven new regressions was checked against the pre-fix code first.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UrDNJkHmm18uu7n7JwV5Qd

.agents/skills/lib_py/delegation/registry.py

@@ -326,6 +326,26 @@ def _build_parser() -> argparse.ArgumentParser:
     return parser
 
 
+def _operator_write(job_id: str, registry_dir: str, **fields) -> int:
+    """Apply an operator-authority write and report refusal on the exit status.
+
+    Before phase 2a this path could not be refused, so it always exited 0. Once
+    the CAS boundary can decline a write, exiting 0 anyway would hide it -- which
+    is exactly how a refused loop re-dispatch looked like success to the wrapper.
+    """
+    from lib_py.delegation import engine  # same package: no sibling hop (see __init__)
+
+    if not engine.cas_enabled():
+        mqtt_common.update_job_status(job_id, registry_dir, **fields)
+        return 0
+    result = mqtt_common.transition_job_status(
+        job_id, registry_dir, _source="registry_cli", **fields)
+    if not result.committed:
+        print("refused: {}".format(result.reason), file=sys.stderr)
+        return 4
+    return 0
+
+
 def main(argv: Optional[List[str]] = None) -> int:
     mqtt_common.ensure_env_loaded()
     mqtt_common.setup_logging(logging.INFO)
@@ -374,11 +394,11 @@ def main(argv: Optional[List[str]] = None) -> int:
 
     if args.command == "status":
         try:
-            update_status(args.job, rd, args.status)
+            rc = _operator_write(args.job, rd, status=args.status)
         except (FileNotFoundError, ValueError) as exc:
             print(str(exc), file=sys.stderr)
             return 1
-        return 0
+        return rc
 
     if args.command == "update":
         fields = {}
@@ -393,11 +413,11 @@ def main(argv: Optional[List[str]] = None) -> int:
         if args.role is not None:
             fields["role"] = args.role
         try:
-            mqtt_common.update_job_status(args.job, rd, **fields)
+            rc = _operator_write(args.job, rd, **fields)
         except FileNotFoundError as exc:
             print(str(exc), file=sys.stderr)
             return 1
-        return 0
+        return rc
 
     if args.command == "get-feedback":
         print(get_feedback(args.job, rd))